Hi My Husband, 75 Yrs,is Doing Nebulization With Duolin And

hi my husband, 75 yrs,is doing nebulization with duolin and mucomix once a day. but we are not clear about the dosage of mucomix. he uses 1 vial of duolin along with 1 ml of mucomix. but doc's prescription (over a yr ago) does not specify whether mucomix is 200mg or 400mg. can u pls clarify. thnx.